Shape Analysis of a Reference Cement.
Shape Analysis of a Reference Cement.
(1606 K)
Garboczi, E. J.; Bullard, J. W.
Cement and Concrete Research, Vol. 34, No. 10,
1933-1937, October 2004.
Keywords:
cements; aggregates
Abstract:
Recently, techniques for acquiring, analyzing, and using
3-D shape infonnation for aggregates (sand, gravel) have
been developed and
demonstrated. These mathematical techniques, based on
spherical hannonic coefficient analysis, have been
applied to X-ray computed
tomography images. X-ray microtomographic images of
cement particles are required to be able to apply these
same mathematical techniques
to analyze Portland cement particle shape. Such images
are available in the Visible Cement Database for a
single reference cement. Actual
cement images, as well as some quantitative results on
the nonsphericity of the particles, are given here.
Three-dimensional cement particle
shapes have never been available before. A demonstration
of how real cement particle shapes will change the
CEMHYD3D cement hydration
model is also given.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899